In 2046, Hilary Clinton rules the planet through the Clinton World Order. As a final attempt to control the Bitcoin cryptocurrency, the New World Govenrment issues a world-wide ban on its usage by creating its own government powered crypto-currency: New Bitcoin [NBT].
Totally government controlled, this faux blockchain is the main difference between NBT and BTC. Just after mining the first genesis block of NBT, Bitcoin access was severely restricted for almost all citizens across the globe and its usage and/or possession became a criminal act.
Yet Bitcoin didn't dissapear completely from the society. Small amounts of BTC are allowed only to selected citizens, but with strict regulations. It's still in limited usage by registered bitcoiners and other cryptocurrency interested groups.
After the censorship attempt, Bitcoin still remains a way to exchange value on the black markets via the Deep Web. Also it is used in highly controlled conditions for research, analytics and survellience, but apart from that, having bitcoins in your possession is now punishable with life in prison.
Rumors & conspiracy theories surface now and again stating that someone will succeed in performing a 51% attack on the NBT blockchain. The consequences of this attack would bring down NBT, Hilary Clinton and the CLinton World Order, resulting in the revival of the true Bitcoin blockchain and the previous order. Some people say, those days are closer than we think...